Author: Robert Hyatt
Date: 08:12:18 02/13/00
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On February 13, 2000 at 00:00:30, Lonnie Cook wrote: >On February 12, 2000 at 19:53:12, Robert Hyatt wrote: > >>On February 11, 2000 at 23:54:03, Tom Kerrigan wrote: >> >>>On February 11, 2000 at 23:42:08, Robert Hyatt wrote: >>> >>>>I am definitely talking about 0c. You take the cpu to that temp, it won't last >>>>long as you get ice crystals, which play hell with gigahertz frequencies. That >>>>was why the cray was never taken below freezing until the immersion versions and >>>>they were not much below 0. >>> >>>Evidently Kryotech has come up with a solution to this problem, because they are >>>cooling the Athlon to -40C and running at 1GHz and AMD supports this. >>> >>>-Tom >> >> >>I don't believe they are doing this. They are applying -40c to the cpu, but >>the heat it is producing prevents the cpu from getting to -40 during operation, >>I'd bet. I'd bet the real cpu temp is well over 0c, if it has a temp >>thermocouple as my xeons. do. My xeons run at about 106F under heavy load, >>for a reference. > >Bob, >How can the real temperature of the CPU be well over 0° when mine is CONTANTLY >being cooled to 45°. heat is also drwn out through the back through the bottom >fan of the tower/refrig area? That is an easy one. In the cpu, all the heat comes from resistance that turns electricity directly into heat. The superG is simply pulling this heat out a lot faster than air cooling would do. This lets them ramp up the Vcc applied to the chip, which lets them increase the clock frequency, since higher voltage overcomes resistance/capacitance/inductance better. And all they are doing is providing a pathway for the heat to leave the core of the cpu chip quickly so that the processor doesn't "melt" which is what happens to many over-clockers. I have a pentium pro cpu chip I kept as an illustrator of just how hot these chips can get. It has a permanent finger-print on the top, where a friend of mine said "hey how hot does this get?" right before he touched it. It removed a layer of skin.
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